Thermal performance of angled, V-shaped and leaning-V-shaped ribs in a rotating rectangular channel with 45° orientation

Wang, Jinsheng; Li, Luo; Wang, Lei; Sundén, Bengt; Wang, Songtao

doi:10.1108/hff-04-2017-0139

Cited by 5 publications

(5 citation statements)

References 40 publications

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“…Therefore, it is difficult to determine, which rib shape brings better thermal performance in the labyrinth channel. Therefore, the ( Nu / Nu 0 )/( f / f 0 ) and ( Nu / Nu 0 )/( f / f 0 ) 1/3 are used to evaluate the thermal performance of the heat transfer devices (Wang et al , 2018b). ( Nu / Nu 0 )/( f / f 0 ), which is also named as area goodness factor, shows the heat transfer ability under the same pressure drop.…”

Section: Resultsmentioning

confidence: 99%

Enhanced heat transfer in a labyrinth channels with ribs of different shape

Wang

et al. 2019

HFF

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Purpose The purpose of this study is to enhance the thermal performance in the labyrinth channel by different ribs shape. The labyrinth channel is a relatively new cooling structure to decrease the temperature near the trailing region of gas turbine. Design/methodology/approach Based on the geometric similarity, a simplified geometric model is used. The k − ω turbulence model is used to close the Navier–Stokes equations. Five rib shapes (one rectangular rib, two arched ribs and two trapezoid ribs) and five Reynolds numbers (10,000 to 50,000) are considered. The Nusselt number, flow structure and friction factor are analyzed. Findings Nusselt number is tightly related to the rib shape in the labyrinth channel. The different shapes of the ribs result in different horseshoe vortex and wake region. In general, the arched rib brings the highest Nusselt number and friction factor. The Nusselt number is increased by 15.8 per cent compared to that of trapezoidal ribs. High Nusselt number is accompanied by the high friction factor in a labyrinth channels. The friction factor is increased by 64.6 per cent compared to rectangular ribs. However, the rib shape has a minor effect on the overall thermal performance. Practical implications This study is useful to protect the trailing region of advanced gas turbine. Originality/value This paper presents the flow structure and heat transfer characteristics in a labyrinth channel with different rib shapes.

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Section: Resultsmentioning

confidence: 99%

Enhanced heat transfer in a labyrinth channels with ribs of different shape

Wang

et al. 2019

HFF

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“…The rib arrangements included inclined ribs, V-shaped ribs and inverted V-shaped ribs. And Wang et al [8] numerically studied the thermal performance of the rotating rectangular channel (2:1) with 45 deg angled, reverse 45 deg angled, 45 deg V-shaped and outer-leaning 45 deg V-shaped ribs, respectively. The above research shows that the rib cooling technology has been extensively studied, but more scholars currently study the flow and heat transfer characteristics of the internal cooling channel where the ribs are arranged, ignoring the effect of the film hole on the cooling characteristics of the rib cooling channel.…”

Section: Introductionmentioning

confidence: 99%

Conjugate Flow and Heat Transfer Mechanism between the Rib Cooling and Film Cooling

Jin¹,

Peng²,

Wu³

et al. 2022

Proceedings of Global Power &Amp; Propulsion Society

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Rib cooling and film cooling are the effective cooling schemes to meet the increasing demands of rising turbine inlet temperatures in modern gas turbine engines. Most studies have been carried out to find the flow and heat transfer characteristic of rib cooling or film cooling individually. While the conjugate heat transfer between these two cooling methods is rarely studied in the literature. In order to evaluate the interplay between the rib cooling and film cooling, the conjugate flow and heat transfer mechanism in two perpendicular flat plate channels connected by a conductive solid wall with a compound film hole through it is studied numerically. Ribs are arranged in the internal cooling channel and the heat conduction in the connecting wall and ribs are considered. The blowing ratios vary from 0.75 to 1.5. SST κ-ω and large-eddy simulation (LES) turbulence model are checked to find the applicability of the turbulence models in this simulation by comparing the numerically predicted results with the experimental results from literature. The results indicate that LES is better at capturing the fine structure of the flow field and has higher accuracy. The arrangement of film hole strengthens the heat transfer capacity of the internal cooling channel. However, the arrangement of ribs reduces the overall cooling efficiency of the mainstream cooling channel.

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“…The rib-induced circulation flow not only creates an impingement effect on the lower and upper walls but also acts to move the warmer air from the boundary layer zone to mix with the cooler bulk in the central core region. Several numerical investigations by Han et al (2003, 2011); Iacovides and Raisee (2008) and Wang et al (2018) were carried out to reveal the influence of the rib configuration on the heat transfer augmentation and the associated pressure drop penalty. It was observed that the rib turbulator configuration affected the pressure drop as well as the heat transfer enhancement.…”

Section: Introductionmentioning

confidence: 99%

“…They reported that the local transport changes were less pronounced when the gap width was 0.5 times the rib height, and thus, for this arrangement, the local and spatially averaged Nusselt number ratios became lower. Wang et al (2018) conducted a numerical study on the heat transfer characteristics of a rotating rectangular channel with variously shaped discrete ribs by the k - ω SST turbulence model. They reported that a small streamwise rib gap can effectively augment the leading wall heat transfer, and the inner-half-rib angle makes the most noticeable impact on heat transfer and pressure drop.…”

Section: Introductionmentioning

confidence: 99%

Influences of secondary flow induced by Coriolis forces and angled ribs on heat transfer in a rotating channel

Hoseinalipour

Shahbazian

Sundén

2019

Int Jnl of Num Meth for HFF

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Purpose The study aims to focus on rotation effects on a ribbed channel of gas turbine blades for internal cooling. The combination and interaction between secondary flows generated by angled rib geometry and Coriolis forces in the rotating channel are studied numerically. Design/methodology/approach A radially outward flow passage as an internal cooling test model with and without ribs is used to perform the investigation. Aspect ratio of the passage is 1:1. Square ribs with e/Dh = 0.1, p/e = 10 and four various rib angles of 90°, 75°, 60° and 45° are configured on both the leading and trailing surfaces along the rotating duct. The study covers a Reynolds number of 10,000 and Rotation number in the range of 0-0.15. Findings Nusselt numbers in the ribbed duct are 2.5 to 3.5 times those of a smooth square duct, depending on the Rotation number and rib angle. The maximum value is attained for the 45° ribbed surface. The synergy angle between the velocity and temperature gradients is improved by the angled rib secondary flows and Coriolis vortex. The decrease of the synergy angle is 8.9, 13.4, 12.1 and 10.1 per cent for the 90°, 75°, 60° and 45° ribbed channels with rotation, respectively. Secondary flow intensity is increased by rotation in the 90° and 75° ribbed ducts and is decreased in 45° and 60° ribbed cases for which the rib-induced secondary flow dominates. Originality/value The primary motivation behind this work is to investigate the possibility of heat transfer enhancement by vortex flow with developing turbulence in the view point of the field synergy principle and secondary flow intensity.

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Thermal performance of angled, V-shaped and leaning-V-shaped ribs in a rotating rectangular channel with 45° orientation

Cited by 5 publications

References 40 publications

Enhanced heat transfer in a labyrinth channels with ribs of different shape

Enhanced heat transfer in a labyrinth channels with ribs of different shape

Conjugate Flow and Heat Transfer Mechanism between the Rib Cooling and Film Cooling

Influences of secondary flow induced by Coriolis forces and angled ribs on heat transfer in a rotating channel

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